Feed and discharge control means for paired rolls within rotary housing



May 2, 1950 Filed F eb. 5, 1946 A. DREISBACH C. FEED AND DISCHARGE CONTROL MEANS FOR PAIRED ROLLS WITHIN ROTARY HOUSING 5 Sheets-Sheet 1 vvs/vrop B CHARLES A. DREISBACH ATTORNEYS M y 2, 1950 c A. DREISBACH 2,506,267

FEED AND DISCI-iARGE CONTROL MEANS FOR PAIRED ROLLS WITHIN ROTARY HOUSING Filed Feb. 5, 1946 I 5 Sheets-Sheet 2 INVENTOI? CHARLES A. DREi SBACH By 1 j mma/ ATTORNEY;

May 2, 1950 v c. A. DREISBACH 2,506,267

FEED AND DISCHARGE CONTROL MEANS FOR PAIRED ROLLS WITHIN ROTARY HOUSING Filed Feb. 5, 1946 5 Sheets-Sheet 3 nvvszvroe CHARLES A. DREISBACH y ATT ORNE Y5 May Filed Feb. 5, 1946 IIIIIIIIIIII IIIIIIIIIIIIIIIIIIIII C. A. DREISBACH FEED AND DISCHARGE CONTROL MEANS FOR PAIRED ROLLS WITHIN ROTARY HOUSING 5' Sheets-Sheet 4 ATTORNEYS May 2, 1950 Filed Feb. 5, 1946 FEED AND DISCI-IARGE CONTROL MEANS FOR PAIRED c A. DREISBACH 2,506,267

ROLLS WITHIN ROTARY HOUSING 5 Sheets-Sheet 5 /NVENTOR CHARLES A. DRElSBACH ATTORNEYS Patented May 2, 1950 risen AND DISCHARGE cosmos MEANS FOR PAIRED ROLLS ROTARY HOUSING Charles A Dreisbach, Yonkers, N. Y., assignor to Standard Radial Blast Corporation, Yonkers, N. Y., a corporation of New York Application February 5, 1946, SerialNo. 645,541

4 Claims. 1 w

The present invention relates to improvements in grinding-mills of the type adapted to crush ores, slag, cinders, and other friable materials, and relates more particularly to grinding-mills of thetype referred to and is characterized by an eccentric crushing-roll coacting with :a central crushing-roll in combination with related features as set forth in the appended claims. The present invention constitutes improvements upon the structure disclosed in U. S. Patent No. 1,776,654.

One of the main objects of thepresent invention is to provide a grinding-mill having superior construction and arrangement of parts, whereby weaknesses and other defects inprior types of grinding-mills arelargely obviated. I

Another and more specific object of the present invention is toeprovide a superior grinding-mill combining reliability of. operation with low cost for manufacture.

A further object of the present invention is to. provide a-lgri'nding-mill ha ving superior resistance to wear by the action of abrasive material being ground.

Still another object of the present invention is to. provide a grinding-mill of the type having a pair of coacting crushing-rolls and provided with a superior construction and arrangement of parts, whereb the structure has maximum resistance to the severe shocks" incident to the functioning of thesaid crushing-rolls. 7

A still further object of thepr'esenjt invention is to provide a grinding-mill having a superior construction and arrangement of parts for effooting the discharge of its contents.

With the above and other objects in view, as will appear to those skilled in th'e'ar't' from the present disclosure, this invention includes all features in the said disclosure which are novel over the prior art.

In the accompanying drawings, in which certain modes of carrying out the present invention are shown for illustrativepurposes': v

Fig. 1 is a top or plan view of a grinding-null embodying the present-invention;

Fig. '2 is a view'of th'e left side of the grinding-mill;

Fig. 3 is a view of the right side of the grinding-mill;

Fig. 4 is a broken transverse sectional view taken on the line 4-4' of Fig.2 ;v

Fig. is a, perspective view of thefeed-c hute and discharge-chutatogether with the controlmeghanism for coincidentally tilting. the same; an

Fig. 6 is a transverse sectional view taken on the line 6--6 ofFigf3.

The particular grinding-mill herein chosen for purposes of illustrating one form of the present invention, includes a drum-like revolving housing generally designated by the reference character It] and including a cylindrically-contoured peripheral wall I] and two ring-like side-walls l2 and i3 suitably braced and welded or otherwise rigidly secured at their outer edges to the said peripheral wall.

Rigidly secured to the outer face of the left side-wall l2 of'the housing I0, is a concentric driving-gear l4 and a concentric track-ring l5 Whichlatter is preferably smaller in diameter than the diameter of the said driving-gear, and restsupon two idler rolls l6 and I! supported in suitable bearings 18 mounted upon a left framemember l9.

The right side-wall l3 of the housing [0, has rigidly secured to its outer face -a concentric driving-gear 20 and a concentric track-ring 2|. The said track ring '2 l' rests upon idler rolls 22 and 23 mounted for rotation in suitable bearings 24 supported on the right frame-member '25.

Extending centrally through the housing l0 and projecting beyond each of the respective opp'o'site sides thereof, is a center-roll shaft 26 sup-- ported for rotation at its respective opposite ends in similar journals 21-21.

One of the journals 2'! above referred to is mounted at the uppe "end of a frame-standard 28 projecting upwardly from the central portion of the left frame-member l9. Interposed betweenthe' upper surface of the frame-standard 28 and the journal 2l supported thereon, are a plurality of helical shock-absorbing springs 29 constructed and arranged to cushion downward shocks impinging upon the shaft 26.

The journal 2-! adjacent the right end of the center-roll shaft 26 is supported on a framestandard 30 projecting upwardly from the right frame-member 25-. interposed between the upper enact the frame-standardijiili and the adjacent journal 21 are also a pluralityof helical shock= absorbing springs 29.

fRigidly secured to the right end of the centerrollshaft 26 is a sprocket-wheel 3|, while just in- Wardly'of the said sprocket-wheel a flywheel 32' is also rigidly connected to the said shaft 26,215 is espeeianywen shown in Fig. 4.

Extending over the sprocket-wheel 3| of the center-roll shaft 26 is a sprocket-chain 33 which also extends O'Vi a sprocket-wheel 34 rigidly mounted upon a drive-shaft 35 adjacent the outer end thereof.

The drive-shaft 35 above referred to extends cross-wise in front of the rotary housing iii and is supported in a journal 35 (Fig. 3) which is supported on the right frame-member 25. At its inner end, the drive-shaft 35 has rigidly attached to it a pinion 31 which meshes into and drives a gear-wheel 3B rigidly mounted upon a countershaft 39, as is indicated in Fig. 3. The said countershaft 39 extends crosswise in front of the housing It and is journaled adjacent each of its respective opposite ends in bearings 45-49, one of which is supported on each of the framemembers i and 25, as is indicated in Fig. 1.

The countershaft has rigidly secured to it two spaced-apart pin-type pinions 4l--4l respectively meshing into the left and right driving-gears i4 and 25, to eifect the rotation of the housing 55 and the parts carried thereby through power applied to the drive-shaft 35.

From the foregoing it will be apparent that the drive-shaft 35 will effect the rotation of both the center-roll shaft 25 and the housing in in the same direction but with the said center-roll shaft turning more rapidly than does the housing it.

Rigidly mounted upon the center-roll shaft 25 in line with the interior of the housing H3, is a center grinding-roll 42 having a toothed periphcry and flanked on each of its respective opposite sides by stationary side-plates 43 and 44. The left side-plate 43 is rigidly supported upon the left frame-member and has a circular outer periphery closely approaching in size the interior periphery of the rotary left side-wall ii of the housing it, as is indicated in Fig. 6'.

In a similar manner, the stationary right side plate 44 is rigidly supported by the right framernember 25 and has a circular outer periphery but slightly smaller in diameter than the inner periphery of the ring-like right side-wall 13 of the housing iii.

Extending through the housing H] in parallelism with the center-roll shaft 26 is an eccentric-roll shaft 45 having rigidly mounted on its center portion an externally-toothed eccentric grinding-roll 45 which coacts with the toothed periphery of the center grinding-roll A2 to effect the grinding of friable material, in a manner as will hereinafter appear.

The left end of the eccentric-roll shaft 45 projects outwardly through the left stationary sideplate at the left of the structure, through an arcuate clearance-slot 4'! in the said side-plate. Similarly, the right end of the shaft 45 projects outwardly through an arcuate clearance-slot 48 formed in the stationary right side-plate 44.

The left end of the eccentric-roll shaft 45 is journaled in the lower inner end of an L-shaped guide-arm i2 having its outer end rigidly secured to a coupling-shaft 55, as is especially well shown in Fig. 1.

The coupling-shaft 55 above referred to is located outside of the housing Ill and extends transversely across the front thereof for being journaled at its respective opposite ends in bearings 5i--5, each carried at the upper end of two similar frame-standards 52-52. One of the said frame-standards 52 extends upwardly from the forward portion of the left frame-member I5, while the companion frame-standard extends upwardly from the right frame-member 25.

In a manner similar to the mounting of its left end, the right end of the eccentric-roll shaft 45 is journaled in the lower inner end of an L-shaped 4 guide-arm 53 of a character similar to the guidearm is before described.

Like the guide-arm 49 the outer end of the guide-arm 53 is rigidly mounted upon the coupling-shaft 5!} adjacent the right end thereof so that the coupling-shaft- 50 may act as a rigid coupling to confine the two guide-arms 29 and 53 to simultaneous and equidistant swinging-movement.

' serve to elevate material to effect its discharge from the housing in a manner as will be hereinafter described.

For the purpose of guiding friable material to a position between the grinding-rolls 32 and 46 as such material is elevated by the lifting-plates 54, a pivotal feed-chute 55 is employed. The said feed-chute is mounted at its lower inner end with capacity for turning movement upon and relative to a shaft 56 mounted for turning movement adjacent each of its respective opposite ends in the stationary side-plates 43 and 44 but projecting outwardly through each of the latter.

At its right end the shaft 56 of the feed-chute 55 has rigidly coupled thereto a V-shaped lever 5'! having two diverging-arms 58 and 59, each of which is pierced at its outer end for the sliding reception respectively of the outer ends of two corresponding guide-rods 6i) and 6!. Each of the guide-rods 65 and 6| just referred to is pivoted at its inner end to the outer end of a lever-arm 52. The said lever-arm is located eXteriOrly of the right side-plate 44 and is mounted upon the right end of the shaft 55 just inwardly of the lever 51, but with capacity for slight turning movement with respect to the said shaft, as is also the feed-chute 55. The hub of the leverarm 62 extends inwardly through the adjacent right side-plate 44 into coupled engagement with the adjacent end of the feed-chute 55 so as tobe substantiallly rigid therewith.

Each of the guide-rods 55 and 6! above referred to is encircled by one of two helical compression-springs 53-63. One of the said springs is compressed between the under surface of the upper arm '58 of the lever 5'! and the upper surface of the lever-arm 62 while the other of said springs is compressed between the upper surface of the lower arm 59 and the under surface of the lever-arm 62. The arrangement of the springs 6353 is such that they serve to normally centralize the lever-arm 62 with respect to the arms 58 and 59 of the V-shaped lever 51 and afford a yielding coupling therebetween.

Rigidly mounted upon the left end of the shaft 55 of the feed-chute 55 is a worm-wheel 54 located in a plane parallel with and just outwardly of the outer face of the left track-ring l5 and meshed into by a worm 65 as is especially well shown in Figs. 2 and 5.

The worm 65 above referred to is rigidly mounted upon the inner end of a control-shaft 65 extending in parallelism with the left side of the structure and having a hand-wheel 57 rigidly mounted upon its outer end' and preferably located in a plane slightly beyond the outer surface of the peripheral wall II. The said control-' 5 shaft -66 is mountedror rotarymovement adjacentv its inner end in a bracket. .68 extending outwardly from the left side-plate: 43, and adjacent its outer end the said control-shaft. is mounted; for rota tion in a bracket 69 upstanding from. the left frame-member #9 as is especially wellshown in.

Fig. 2..

Intermediate the outer face of the bracket 59 and the inner face of the hand-wheel '51, the control-shaft 65 has rigidly mounted thereon a toothed locking-wheel H! which is adapted to be releasably-engaged by a pawl H mounted at. the upper end of the bracket 69 as is. shown in Figs.

1 and 2. The engagementofthepawl II with: the locking-wheel 10 serves to positivelyhold the control-shaft 65 against unintentional rotation due to vibration or the like.

To. the rear of the center-rollshaft 26 the stationary left side-plate 43 is formed with an. opening 12 for the reception of a pivotal dis-,

Normally the discharge-chute 13 is tilted inwardly-and-downwardly as is shown by full lines in Figs. 2, 5- and 6 in-which position. the inner end of the said chute extends but slightly inwardly through theleft side-plate 43, aswill appear from an inspection of. Fig. 6.

When the discharge-chute 13 is turned into its outwardly-and-downwardly-inclined position as indicated by the broken lines in Figs. 5 and 6, the inner end of the said discharge-chute projects well into the interior of the housing. t0 and in position to receive material dropping from the lifting-plates 54: either directly into the open inner end of the said discharge-chute or ontoa deflecting-plate 76- which issecured to the right side-plate 44 as is indicated in Fig. 6,, and is so inclined as to feed material directly into the open inner end of the dischargeechute 13'.

The pivots (the opposite ends of. the. trunnion-- shaft 74) of the discharge-chute 1.3; are. so positioned that the outer portion. of the said discharge-chute is the heaviest and tends to descend.

by gravity to thus coincidentally elevate its inner end. Forthe purpose of. controlling the movement of the discharge-chute 13 into and out. of the position in which it is shown. by full lines or the position in which it is shown by broken linesin Figs. 5 and 6, the said discharge-chute has attached to its outer portion a cable 11 or other suitable flexible member which has its oppositeend secured to. and wound upon a wind-up reel.

l8 mounted uponthe control-shaft 66 before referred to.

From the foregoing it will be seen that by turning: the hand-wheel. 6? in a counterclockwise direction as viewed in Fig. 5, the discharge-chute.-

of the feed-chute 55 just above; describedwill-v".

permit the material being lifted. and dropped by the. lifting-plates 54 to fall unhindered by the feed-chute 55 ontothe deflectin -plate 1.6 and into the open inner end of the discharge-chute 13 p for passage outwardly into any suitable receptacle.

On the other hand, should the hand-wheel 6] be turned in a clockwise direction as viewed in Fig. 5, the discharge-chute 13- will be shifted by 101 means of the cable 11 from the position in which.

it. is: shown. by broken lines in Fig. 5 into the position in which it is shown by full lines in the same figure. At the same time that the dischargechute is is being shifted as described the feedrchute will be shifted from the position in which it is shown. by broken lines in Fig. 5 back into the position in. which it is shown by full lines in the same figure to thereby feed the material elevated by the liftingplates 54 directly between the grinding-rolls 42 and 46.

Located between and extending in parallelism with the frame-members l9 and 25 is a trough or tank 9 in which the lower portion of the housing 50 revolves.

Operation Friable material to be ground or crushed may be introduced into the interior of the housing H1 in any suitable manner such for instance as by charging the said material through the dischargechute T3while the latter is in its upwardly-andoutwardly-inclined position as shown by full lines in Figs. 5 and 6. The said friable material will be lifted by the lifting-plates 54 and continuously dropped upon the upper surface of the feed-chute 55 to slide onto the periphery of the center grinding roll 42.

As the material is fed ontothe center grindingroll as above described, it will pass beneath the eccentric grinding-roll 46 and will be crushed. During the grinding operation large pieces of rock, cinders, clinkers or other friable material passing betweenthe grinding-rolls 42 and 45 will cause the .latter grinding-roll to rise and fall similarly moving its shaft 45. The respective opposite ends of the shaft 45 will be held to substantially corresponding up-and-down movement by the guide-arms 49' and 53' in conjunction with the coupling-shaft 50.

During the vertical movement of the eccentric grinding-roll 46 and its shaft 45 the respective opposite ends of the said shaft will play up and down in the arcuate clearance-slots 41 and 48 respectively formed in the side-plates 43 and 44.

The friable material will of course ultimately pass from between the grinding-rolls 42 and 46 and will dropinto the. bottom of the housing ill to be again lifted by the lifting-plates 54 and reground as much as desired.

During the grinding operation water may bev circulated through the lower portion of the housing H! from the trough or tank 19 so that friable materials may be washed out as rapidly as they are ground and only the. coarser particles again elevated for regrinding in the manner above described.

When it. is desired to discharge the contents of the housing 10 the control-shaft 66 will be turned by means of its hand-wheel 61 to swing the feed-chute 55 into the position in which it is shown by broken lines in Fig. 5 and to simultaneously swing the discharge-chute 13 into the position in which it. is shown by broken lines in Fig. 5. Thereafter solid material contained. within the housing. [0 willfall off from the lifting plates 54 and instead of being guided between the two grinding-rolls 42 and 46 the said material will pass outwardly through the discharge-chute '13.

The invention may be carried out in other specific Ways than those herein set forth without departing from the spirit and essential characteristics of the invention, and the present embodiments are, therefore, to be considered in all,

8 ledges when the discharge-chute is tilted into its outwardly-inclined position; and control-means positively connected to both the said feed-chute respects as illustrative and not restrictive, and all 10 changes coming within the meaning and equivalency range of the appended claims are intended to be embraced therein.

I claim:

1. A grinding-mill, including in combination: a rotary housing having a peripheral wall and an opening at each side; two opposite stationary side-plates respectively forming closures for the sides of the said housing, one of the said sideplates being provided with a chute-receiving opening; lifting-ledges within the said rotary housing and movable therewith; means for turning the said rotary housing; a center crushingroll located between the said stationary sideplates and encircled by the said housing; means for turning the said center crushing-roll; an eccentric crushing-roll also located between the said side-plates and positioned to coact with the surface of the said center crushing-roll; guide-means fo the said eccentric crushing-roll; a movable feed-chute located within th said housing and movable into and out of position to convey material from the said lifting-ledges to a point be-.

tween the two said crushing-rolls; a dischargechute extending through the chute-receiving opening in the aforesaid side-plate of the housing and movable into an outwardly-tilting and an inwardly-tilting position, with its inner portion extending in position to receive material from the said lifting-ledges when the said feed-chute is retired; and control-means positively connected to both the said feed-chute and the said discharge-chute to positively move both thereof and constructed and arranged to coincidentally positively move the said feed-chute into its operative position and to tilt the said discharge-chute into its inwardly-inclined position.

2. A grinding-mill, including in combination: a rotary housing having a peripheral wall and an opening at each side; two opposite stationary side-plates respectively forming closures for the sides of the said housing, one of the said sideplates being provided with a chute-receiving opening; lifting-ledges within the said rotary housing and movable therewith; means for turning the said rotary housing; a center crushingroll located between the said stationary sideplates and encircled .by the said housing; means for turning the said center crushing-roll; an eccentric crushing-roll also located between the said side-plates and positioned to coact with the surface of the said center crushing-roll; guidemeans for the said eccentric crushing-roll; a pivotal feed-chute located within the said housing and pivoted at a point closely adjacent the said crushing-rolls and having a swinging end movable into and out of position closely adjacent the said lifting-ledges; a discharge-chute extending through the chute-receiving opening in the aforesaid side-plate of the housing and pivoted intermediate its respective opposite ends for being tilted into and out of an outwardly-inclined position, the said discharge-chute being constructed and arranged to have its inner end positioned to receive material from the said liftingand the said discharge-chute to positively move both thereof and constructed and arranged to positively coincidentally move the said feedchute into its operative position and to tilt the said discharge-chute into its inwardly-inclined position 3. A grinding-mill, including in combination: a rotary housing having a peripheral wall and an opening at each side; two opposite stationary side-plates respectively forming closures for the sides of the said housing, one of the said sideplates being provided with a chute-receiving opening; lifting-ledges within the said rotary housing and movable therewith; means for turning the said rotary housing; a center crushingroll located between the said stationary sideplates and encircled by the said housing; means for turning the said center crushing-roll; an ec-' centric crushing-roll also located between the said side-plates and positioned to coact with the surface of the said center crushing-roll; guidemeans for the said eccentric crushing-roll; a pivotal feed-chute located within the said housing and pivoted at a point closely adjacent the said crushing-rolls and having a swinging end movable into and out of positionclosely adjacent the said lifting-ledges; a discharge-chute extending through the chute-receiving opening in the aforesaid side-plate of the housing and pivoted intermediate its respective opposite ends for being tilted into and out of an outwardly-inclined position, the said discharge-chute being constructed and arranged to have its inner end positioned to receive material from the said lifting ledges when the discharge-chute is tilted into its outwardly-inclined position; and controlmeans including a rotary control-shaft, a windup member driven by the said control-shaft, a flexible member connected at one end to the outer portion of the said discharge-chute for tilting the same and connected at its opposite end to the said wind-up member, a first gear also operatively connected to the said rotary control-shaft for being turned thereby, and a second gear-member coacting with the said first gearmember and connected to the said feed-chute for tilting the same coincidentally with the tilting of the said discharge-chute by the said flexible member.

4. A grinding-mill, including in combination: a rotary housing having a peripheral wall and an opening at each side, two opposite stationary side-plates respectively forming closures for the sides of the said housing, one of the said sideplates being provided with a chute-receiving opening; lifting-ledges within the said rotary housing and movable therewith; means for turning the said rotary housing; a center crushing roll located between the said stationary sideplates and encircled by the said housing means for turning the said center crushing-roll; an eccentric crushing-roll also located between the said side-plates and positioned to coact with the surface of the said center crushing-roll; guidemeans for the said eccentric crushing-roll; a pivotal feed-chute located within the said housing and pivoted at a point closely adjacent the said crushing-rolls and having a swinging end movable into and out of position closely adjacent the said lifting-ledges; a discharge-chute extending through the chute-receiving opening in the aforesaid side-plate. of, the housing and pivoted intermediate its respective opposite ends for being tilted into and out of an outwardly-inclined position, the said discharge-chute being constructed and arranged to have its inner end positioned to receive material from the said lifting-ledges when the discharge-chute is tilted into its outwardlyinclined position; a rotary control-shaft; a reel mounted on the said control-shaft; a flexible cord-like member connected at one end to the outer portion of the said discharge-chute for tilting the same and connected at its opposite end to the said reel for being wound thereon; a worm also carried by the said control-shaft; and a worm-wheel connected to the said feed-chute and meshing into the said worm for being turned thereby to tilt the said feed-chute coincidentally 10 with the tilting of the said discharge-chute by the said flexible member.

CHAS A. DREISBACH.

REFERENCES CITED 

